CN111721150A - A compact multi-stage series PCHE heat exchanger and heat exchange method - Google Patents

Abstract

The invention discloses a compact multi-stage series PCHE heat exchanger and a heat exchange method. The heat exchanger includes a regenerator, a precooler and a connecting pipeline. The specific regenerator and the precooler include respective The front cover plate, several heat medium plates, cold medium plates and back cover are composed. The microchannels on the heat medium plates and the cold medium plates are processed by etching. The supercritical CO2 power generation system is the application background, which integrates the functions of the regenerator and the precooler in the supercritical CO2 power generation system. The heat exchanger system maximizes the effective use of the given space.

Description

A compact multi-stage series PCHE heat exchanger and heat exchange method

technical field

The invention belongs to the technical field of heat exchange devices, and relates to a compact multi-stage series-connected PCHE heat exchanger and a heat exchange method.

Background technique

Printed circuit heat exchanger (PCHE) belongs to the category of microchannel plate heat exchanger. PCHE has the advantages of compact structure, high temperature resistance, high pressure resistance, safety and reliability, etc. It is widely used in refrigeration and air conditioning, oil and gas, nuclear industry, chemical industry, power industry and other fields.

At present, the common PCHE heat exchangers are mostly square, and the inlet and outlet pipes are distributed on 4 different sides of the heat exchanger, so that the inlet and outlet pipes of the heat exchanger are scattered and occupy a large space. In addition, in general, a PCHE heat exchanger only realizes the heat exchanger function of one loop, and multiple independent PCHE heat exchangers are required to achieve multiple heat exchanges in several loops, so that there will be more heat exchanger inlets and outlets. Connect the tubes to take up more space.

In some special applications, such as ships, offshore platforms, etc., due to the narrow space and special requirements for the layout shape, the space utilization rate of the ordinary square independent PCHE heat exchanger is too low, and a specially designed heat exchanger is required to Meet special needs.

SUMMARY OF THE INVENTION

In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a compact series PCHE heat exchanger and a heat exchange method suitable for the requirement of cylindrical arrangement. Taking the supercritical CO2 cycle power generation system as the application background, the The heat exchanger is arranged in a cylindrical shape as the space layout requirement. This arrangement maximizes the use of the cylindrical space and meets the special needs of the cylindrical space layout.

For achieving the above object, the technical scheme adopted in the present invention is as follows:

A compact multi-stage series PCHE heat exchanger, the heat exchanger system can realize the functions of a regenerator and a precooler in a supercritical CO2 power generation system, and the whole is cylindrical, and the system includes a regenerator, a precooler The regenerator includes a regenerator front cover 1.1, a number of regenerator cold medium plates 1.2, and a number of regenerator heat medium plates that are welded and connected as a whole from front to back. 1.3 and the rear cover plate 1.4 of the regenerator, the pre-cooler includes a pre-cooler front cover plate 2.1, a number of pre-cooler heat medium plates 2.2, a number of pre-cooler cold medium plates that are welded and connected as a whole from front to back. Sheet 2.3 and precooler rear cover plate 2.4, the inlet and outlet pipes include regenerator hot side inlet pipe 3, precooler hot side outlet pipe 5, regenerator cold side outlet pipe 6, regenerator cold side inlet pipe Pipe 7, cooling water outlet pipe 8 and cooling water inlet pipe 9, the connecting pipe is the regenerator hot side outlet-precooler hot side inlet connecting pipe 4, the regenerator and the precooler pass through the regenerator The hot side outlet-precooler hot side inlet connecting pipe 4 is connected together; the regenerator cold medium plate 1.2, the regenerator heat medium plate 1.3, the precooler heat medium plate 2.2, the precooler cold medium plate The medium plates 2.3 are all plates with microchannels etched on the metal plate surface, the regenerator cold medium plates 1.2 and the regenerator heat medium plates 1.3 are distributed at intervals, and the precooler heat medium plates 2.2 and The regenerator cold medium plates 2.3 are distributed at intervals;

The CO2 hot side inlet a, CO2 cold side outlet b, CO2 cold side inlet c and CO2 hot side outlet d are distributed at the same position of the regenerator cold medium plate 1.2 and the regenerator heat medium plate 1.3; There are CO2 hot side inlet a and CO2 cold side outlet b at the same position as the regenerator cold medium plate 1.2 and the regenerator hot medium plate 1.3 on the regenerator front cover 1.1, and the regenerator rear cover 1.4 There are CO2 cold side inlet c and CO2 hot side outlet d on the same position as regenerator cold medium plate 1.2 and regenerator heat medium plate 1.3;

The hot side inlet e, hot water outlet f, cold water inlet g, and hot side outlet h are distributed on the same position of the precooler heat medium plate 2.2 and the precooler cold medium plate 2.3; on the front cover of the precooler There are hot side inlet e and hot water outlet f on the plate 2.1 at the same position as the precooler heat medium plate 2.2 and the precooler cold medium plate 2.3. The precooler rear cover plate 2.4 is connected to the precooler heat medium. There are cold water inlet g and hot side outlet h on the same position of plate 2.2 and precooler cold medium plate 2.3;

One end of the regenerator hot side inlet pipe 3 is connected to the CO2 hot side inlet a on the regenerator front cover 1.1, and the other end is an external pipe interface, the regenerator hot side outlet-precooler hot side inlet connection pipe One end of 4 is connected to the CO2 hot side outlet d of the rear cover of the regenerator, the other end is connected to the hot side inlet e of the front cover 2.1 of the precooler, and the hot side outlet pipe 5 of the precooler is connected to the rear cover of the precooler. 2.4 The hot side outlet h is connected, the other end is the external pipe interface, the regenerator cold side outlet pipe 6 is connected to the CO2 cold side outlet b on the regenerator front cover 1.1, and the other end is the external pipe interface, the regenerator. The cold side inlet pipe 7 is connected to the CO2 cold side inlet c on the rear cover plate 1.4 of the regenerator, the other end is an external pipe interface, and the cooling water outlet pipe 8 is connected to the hot water outlet f on the front cover plate 2.1 of the precooler, The other end is an external pipe interface, the cooling water inlet pipe 9 is connected to the cold water inlet g on the rear cover plate 2.4 of the precooler, and the other end is an external pipe interface.

The regenerator cold medium plate 1.2, the regenerator heat medium plate 1.3, the precooler heat medium plate 2.2 and the precooler cold medium plate 2.3 are fan-shaped as a whole, and the microchannel paths are radially distributed on the fan surface, Shuttle back and forth between different fan-shaped areas for heat exchange.

The welding connection is a vacuum diffusion welding connection.

The heat exchange method of the compact multi-stage series PCHE heat exchanger, the external high temperature CO2 enters the regenerator heat medium plate 1.3 from the regenerator hot side inlet pipe 3, and releases heat from the regenerator hot side outlet. - The precooler hot side inlet connection pipe 4 enters the precooler heat medium plate 2.2, and after further cooling, the precooler hot side outlet pipe 5 flows out of the heat exchanger for use by external equipment; the external low temperature CO2 is cooled by the regenerator The side inlet pipe 7 enters the cold medium plate 1.2 of the regenerator, and after absorbing heat, it flows out of the heat exchanger through the cold side outlet pipe 6 of the regenerator for use by external equipment; the external cooling water enters the precooler through the cooling water inlet pipe 9. The medium plate 2.3 flows out of the heat exchanger through the cooling water outlet pipe 8 after absorbing the heat on the CO2 side.

The present invention has the following beneficial effects:

(1) It is suitable for the arrangement of the cylindrical area: the present invention integrates two heat exchangers, a regenerator and a precooler in a cylindrical shape, and the inlet and outlet pipes of the regenerator and the precooler are also in the cylindrical area. . Such an arrangement makes the most of the cylindrical space and meets the special needs of the cylindrical space arrangement.

(2) The overall path of the heat exchanger plate is fan-shaped, and the cold end and the hot end are not in contact, which reduces the direct heat transfer between the cold end and the hot end, and also reduces the thermal stress problem of the heat exchanger.

Description of drawings

Figure 1 is an exploded schematic diagram of the structure of the regenerator.

Among them, 1.1 is the front cover of the regenerator, 1.2 is the cold medium plate of the regenerator, 1.3 is the heat medium plate of the regenerator, and 1.4 is the rear cover of the regenerator.

Figure 2 is a schematic exploded view of the structure of the precooler.

Among them, 2.1 is the front cover of the precooler, 2.2 is the heat medium plate of the precooler, 2.3 is the cold medium plate of the precooler, and 2.4 is the rear cover of the precooler.

FIG. 3 is an overall schematic diagram of the heat exchanger system.

Among them, 3 is the inlet pipe of the hot side of the regenerator, 4 is the outlet pipe of the hot side of the regenerator and the inlet of the hot side of the precooler, 5 is the outlet pipe of the hot side of the precooler, 6 is the outlet pipe of the cold side of the regenerator, 7 is the cold side inlet pipe of the regenerator, 8 is the cooling water outlet pipe, 9 is the cooling water inlet pipe,

FIG. 4 is a schematic diagram of the heat medium plate of the regenerator.

FIG. 5 is a schematic diagram of the cold medium plate of the regenerator.

Figure 6 is a schematic diagram of the front cover of the regenerator.

FIG. 7 is a schematic diagram of the rear cover plate of the regenerator.

FIG. 8 is a schematic diagram of a precooler heat medium plate.

FIG. 9 is a schematic diagram of the cold medium plate of the precooler.

Figure 10 is a schematic diagram of the front cover of the precooler.

Figure 11 is a schematic diagram of the rear cover of the precooler.

where a is the CO2 hot side inlet, b is the CO2 cold side outlet, c is the CO2 cold side inlet, d is the CO2 hot side outlet, e is the hot side inlet, f is the hot water outlet, g is the cold water inlet, and h is the hot side side exit.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, Figure 2 and Figure 3, a compact multi-stage series PCHE heat exchanger of the present invention, the heat exchanger system can realize the functions of a regenerator and a precooler in a supercritical CO2 power generation system, The whole is cylindrical, and the system includes a regenerator, a precooler, inlet and outlet pipes and connecting pipes; the regenerator includes a regenerator front cover plate 1.1, a number of regenerators, which are welded and connected as a whole from front to back. Cold medium plate 1.2, several regenerator heat medium plates 1.3 and regenerator rear cover plate 1.4, the precooler includes a precooler front cover plate 2.1 welded and connected as a whole from front to back in sequence, a number of precooler Heater heat medium plate 2.2, several precooler cold medium plates 2.3 and precooler rear cover plate 2.4, the inlet and outlet pipes include regenerator hot side inlet pipe 3, precooler hot side outlet pipe 5, return pipe Heater cold side outlet pipe 6, regenerator cold side inlet pipe 7, cooling water outlet pipe 8 and cooling water inlet pipe 9, the connection pipe is the regenerator hot side outlet-precooler hot side inlet connection pipe 4 , the regenerator and the precooler are connected together through the hot side outlet of the regenerator - the hot side inlet of the precooler connecting pipe 4; the regenerator cold medium plate 1.2, the regenerator heat medium plate 1.3 , the precooler heat medium plate 2.2, the precooler cold medium plate 2.3 are the plates with microchannels etched on the metal plate, the regenerator cold medium plate 1.2 and the regenerator heat medium plate 1.3 Spaced distribution, the precooler heat medium plates 2.2 and the regenerator cold medium plates 2.3 are distributed at intervals.

As shown in Figure 4, Figure 4, Figure 6 and Figure 7, the CO2 hot side inlet a, CO2 cold side outlet b, CO2 hot side inlet a, CO2 cold side outlet b, CO2 cold side inlet c and CO2 hot side outlet d; there are CO2 hot side inlets a and CO2 cold side outlet b, there are CO2 cold side inlet c and CO2 hot side outlet d on the same position as the regenerator cold medium plate 1.2 and the regenerator heat medium plate 1.3 on the rear cover plate 1.4 of the regenerator.

As shown in Figure 8, Figure 9, Figure 10 and Figure 11, the hot side inlet e, the hot water outlet f, the hot side inlet e, the hot water outlet f, Cold water inlet g, hot side outlet h; on the front cover plate 2.1 of the precooler, there are hot side inlet e and hot water outlet f at the same position as the precooler heat medium plate 2.2 and the precooler cold medium plate 2.3 , There is a cold water inlet g and a hot side outlet h on the same position of the precooler rear cover plate 2.4 as the precooler heat medium plate 2.2 and the precooler cold medium plate 2.3.

One end of the regenerator hot side inlet pipe 3 is connected to the CO2 hot side inlet a on the regenerator front cover 1.1, and the other end is an external pipe interface, the regenerator hot side outlet-precooler hot side inlet connection pipe One end of 4 is connected to the CO2 hot side outlet d of the rear cover of the regenerator, the other end is connected to the hot side inlet e of the front cover 2.1 of the precooler, and the hot side outlet pipe 5 of the precooler is connected to the rear cover of the precooler. 2.4 The hot side outlet h is connected, the other end is the external pipe interface, the regenerator cold side outlet pipe 6 is connected to the CO2 cold side outlet b on the regenerator front cover 1.1, and the other end is the external pipe interface, the regenerator. The cold side inlet pipe 7 is connected to the CO2 cold side inlet c on the rear cover plate 1.4 of the regenerator, the other end is an external pipe interface, and the cooling water outlet pipe 8 is connected to the hot water outlet f on the front cover plate 2.1 of the precooler, The other end is an external pipe interface, the cooling water inlet pipe 9 is connected to the cold water inlet g on the rear cover plate 2.4 of the precooler, and the other end is an external pipe interface.

As shown in Figure 4, Figure 5, Figure 8 and Figure 9, the heat exchanger plate of the present invention is fan-shaped as a whole, and the micro-channels are radially distributed on the fan surface, and the fluid shuttles back and forth in the direction of the arrow to different fan-shaped areas for heat exchange.

As shown in Figure 3, a heat exchange method of a compact multi-stage series PCHE heat exchanger of the present invention, the external high temperature CO2 enters the regenerator heat medium plate 1.3 from the regenerator hot side inlet pipe 3, and releases heat by Regenerator hot side outlet - precooler hot side inlet connection pipe 4 enters precooler heat medium plate 2.2, and after further cooling, it flows out of precooler hot side outlet pipe 5 out of heat exchanger for external equipment use; external low temperature CO2 enters the cold medium plate 1.2 of the regenerator through the inlet pipe 7 on the cold side of the regenerator, and after absorbing heat, it flows out of the heat exchanger through the outlet pipe 6 on the cold side of the regenerator for use by external equipment; the external cooling water is used by the cooling water inlet pipe 9 Enter the cold medium plate 2.3 of the precooler, absorb the heat from the CO2 side, and flow out of the heat exchanger through the cooling water outlet pipe 8.

The above detailed description is only a preferred embodiment of the present invention. If the supply direction of the external pipes of the heat exchanger changes, for example, the cooling water inlet and outlet are behind the heat exchanger, it is only necessary to adjust the direction of the connecting pipes, and the present invention cannot be limited by this. range. That is, all equivalent changes and modifications made according to the scope of the application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims (4)

1. A compact multi-stage series PCHE heat exchanger is characterized in that the heat exchanger system can realize the functions of a heat regenerator and a precooler in a supercritical CO2 power generation system, the whole heat exchanger system is cylindrical, and the system comprises the heat regenerator, the precooler, an inlet and outlet pipeline and a connecting pipe; the precooler comprises a heat regenerator front cover plate (1.1), a plurality of heat regenerator cold medium plates (1.2), a plurality of heat regenerator hot medium plates (1.3) and a heat regenerator rear cover plate (1.4) which are sequentially welded and connected into a whole from front to back, the precooler comprises a precooler front cover plate (2.1), a plurality of precooler hot medium plates (2.2), a plurality of precooler cold medium plates (2.3) and a precooler rear cover plate (2.4) which are sequentially welded and connected into a whole from front to back, the inlet and outlet pipeline comprises a heat regenerator hot side inlet pipeline (3), a precooler hot side outlet pipeline (5), a heat regenerator cold side outlet pipeline (6), a heat regenerator cold side inlet pipeline (7), a cooling water outlet pipeline (8) and a cooling water inlet pipeline (9), the connecting pipes are precooler hot side outlet-precooler hot side inlet connecting pipes (4), and the heat regenerator are connected with each other through the heat regenerator hot side outlet-precooler hot side inlet connecting pipes (4) Starting; the heat regenerator cold medium plate (1.2), the heat regenerator hot medium plate (1.3), the precooler hot medium plate (2.2) and the precooler cold medium plate (2.3) are plates with micro-channels etched on metal plate surfaces, the heat regenerator cold medium plate (1.2) and the heat regenerator hot medium plate (1.3) are distributed at intervals, and the precooler hot medium plate (2.2) and the heat regenerator cold medium plate (2.3) are distributed at intervals;

the same positions of the regenerator cold medium plate (1.2) and the regenerator hot medium plate (1.3) are distributed with a CO2 hot side inlet (a), a CO2 cold side outlet (b), a CO2 cold side inlet (c) and a CO2 hot side outlet (d); a CO2 hot side inlet (a) and a CO2 cold side outlet (b) are arranged on the same position of a regenerator front cover plate (1.1) as a regenerator cold medium plate (1.2) and a regenerator hot medium plate (1.3), and a CO2 cold side inlet (c) and a CO2 hot side outlet (d) are arranged on the same position of a regenerator rear cover plate (1.4) as the regenerator cold medium plate (1.2) and the regenerator hot medium plate (1.3);

a hot side inlet (e), a hot water outlet (f), a cold water inlet (g) and a hot side outlet (h) are distributed at the same positions of the precooler heat medium plate (2.2) and the precooler cold medium plate (2.3); a hot side inlet (e) and a hot water outlet (f) are arranged on the same position of the precooler front cover plate (2.1) as the precooler heat medium plate (2.2) and the precooler cold medium plate (2.3), and a cold water inlet (g) and a hot side outlet (h) are arranged on the same position of the precooler rear cover plate (2.4) as the precooler heat medium plate (2.2) and the precooler cold medium plate (2.3);

one end of a hot side inlet pipeline (3) of the heat regenerator is connected with a CO2 hot side inlet (a) on a front cover plate (1.1) of the heat regenerator, the other end of the hot side inlet pipeline is an external pipeline interface, one end of a hot side outlet-precooler hot side inlet connecting pipe (4) of the heat regenerator is connected with a CO2 hot side outlet (d) of a rear cover plate of the heat regenerator, the other end of the hot side outlet pipeline is connected with a hot side inlet (e) of the front cover plate (2.1) of the precooler, a precooler hot side outlet pipeline (5) is connected with a hot side outlet (h) of the rear cover plate (2.4) of the precooler, the other end of the hot side outlet pipeline is an external pipeline interface, a cold side outlet pipeline (6) of the heat regenerator is connected with a CO2 cold side outlet (b) on the front cover plate (1.1) of the heat regenerator, the other end of the cold side inlet pipeline interface is connected with a CO2 inlet (c) on the rear cover plate (1.4) of the heat regenerator, the other end of the cold, the other end is an external pipeline interface, a cooling water inlet pipeline (9) is connected with a cold water inlet (g) on a rear cover plate (2.4) of the precooler, and the other end is the external pipeline interface.

2. The compact multi-stage series PCHE heat exchanger according to claim 1, characterized in that the regenerator cold medium plate (1.2) and the regenerator hot medium plate (1.3) and the precooler hot medium plate (2.2) and the precooler cold medium plate (2.3) are in a fan shape as a whole, and the microchannel passes are radially distributed on the fan surface and shuttle to different fan-shaped areas to exchange heat.

3. The compact, multi-stage, in-line PCHE heat exchanger of claim 1, wherein the welded connection is a vacuum diffusion welded connection.

4. The heat exchange method of the compact multi-stage serial PCHE heat exchanger is characterized in that external high-temperature CO2 enters the heat regenerator heat medium plate (1.3) through a heat regenerator hot side inlet pipe (3), enters the precooler heat medium plate (2.2) through a heat regenerator hot side outlet-precooler hot side inlet connecting pipe (4) after releasing heat, and flows out of the heat exchanger for external equipment through a precooler hot side outlet pipe (5) after being further cooled; external low-temperature CO2 enters a regenerator cold medium plate (1.2) through a regenerator cold side inlet pipeline (7), absorbs heat and then flows out of the heat exchanger through a regenerator cold side outlet pipeline (6) for use by external equipment; external cooling water enters the precooler cold medium plate (2.3) through a cooling water inlet pipeline (9), absorbs heat at the CO2 side and then flows out of the heat exchanger through a cooling water outlet pipeline (8).

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